The Periodic Table of Elements
20
Ca
Calcium
40.078(4) amu
Additional Information:
| State | Group Block | Density | Atomic Radius | Electron Affinity | Ionization Energy | Melting Point | Boiling Point | Year Discovered |
|---|---|---|---|---|---|---|---|---|
| solid | alkaline earth metal | 1.55 kg/L | 174 pm | -2 | 590 kJ/mol | 1115 °K | 1757 °K | Ancient |
